.app-course{
    width: 100%;
    height: 100%;

    .icon-return{
        display: flex;
        align-items: center;
        line-height: 40px;
        font-size: 26px;
        padding-left: 8px;
        color: #fff;
        display: block;
        background-color: #4294ff;
    }
    .video-intr{
        /* padding: 10px 16px; */
        top: -1px;
        height: 220px;
        width: 100%;
        background-color: #fff;
        position: relative;

        

        video{
            width: 100%;
            /* margin-top: 15px; */
        }

        .player{
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
            justify-content: space-between;
            align-items: center;
            i{
                font-size: 36px;
                color: #fff;
            }
            span{
                color: #fff;
                font-size: 14px;
                margin-top: 10px;
            }
        }
    }

    .text-intr{
        padding: 16px;
        position: relative;
        .first{
            h3{
                line-height: 40px;
            }
            .time{
                width: 100%;
                justify-content: space-between;
                padding-bottom: 10px;
                margin-bottom: 16px;
                border-bottom: 1px solid #ccc;

                .minutes{
                    margin-left: -90px;
                }
                p{
                    font-size: 14px;
                    /* font-weight: bold; */
                    color: #999;

                    span{
                        font-size: 20px;
                        font-weight: bold;
                        color: #000;
                    }
                }

                span{
                    font-size: 14px;
                    color: #999;
                    font-weight: normal;

                    i{
                        font-size: 14px;
                    }
                }
            }
        }

        .second{
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            margin-bottom: 16px;
            .head{
                width: 80px;
                height: 80px;
                border-radius: 50%;
                overflow: hidden;

                img{
                    width: 100%;
                    height: 80px;
                }
            }
            .second-text{
                margin-left: -24px;
                h4{
                    font-size: 18px;
                    line-height: 30px;
                }
                span{
                    font-size: 14px;
                    color: #999;
                }
            }

            a{
                width: 80px;
                height: 35px;
                border-radius: 23px;
                background-color: rgba(66, 148, 255, 100);
                line-height: 35px;
                text-align: center;
                color: #fff;
                font-size: 14px;
            }
            p{
                margin-top: 10px;
                color: rgba(138, 138, 138, 100);
                font-size: 16px;
                line-height: 26px;
                overflow: hidden;
                text-overflow: ellipsis;
                display: -webkit-box;
                -webkit-line-clamp: 2; 
                -webkit-box-orient: vertical;
            }
        }

        .third{
            justify-content: space-between;

            .frequency{
                i{
                    font-size: 24px;
                }
                p{
                    font-size: 14px;
                    color: #999;
                    margin-left: 24px;
                    line-height: 34px;
                }
            }
            .apparatus{
                margin-left: -50px;
                i{
                    font-size: 24px;
                }
                p{
                    font-size: 14px;
                    color: #999;
                    margin-left: 24px;
                    line-height: 34px;
                }
            }
        }

        .fourth{
            width: 310px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: rgba(66, 148, 255, 100);
            color: #fff;
            border-radius: 26px;
            position: absolute;
            left: 50%;
            bottom: -45px;
            transform: translateX(-50%);
        }
    }
}